package com.example.goodpet.utils;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Base64;

import java.io.ByteArrayOutputStream;

public class ImageUtil {
    /**
     * 将bitmap图片转换为String
     * @param bitmap
     * @return
     */
    public static String ImageToString(Bitmap bitmap){
        ByteArrayOutputStream byStream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 80, byStream);
        byte[] byteArray = byStream.toByteArray();
        String imgString = new String(Base64.encodeToString(byteArray, Base64.DEFAULT));
        return imgString;
    }

    /**
     * 获取经过尺寸压缩和质量压缩的照片
     * @param srcPath
     * @return
     */
    public static Bitmap getImage(String srcPath) {
        BitmapFactory.Options newOpts = new BitmapFactory.Options();
        //开始读入图片，此时把options.inJustDecodeBounds 设回true了
        newOpts.inJustDecodeBounds = true;
        Bitmap bitmap = BitmapFactory.decodeFile(srcPath,newOpts);//此时返回bm为空

        newOpts.inJustDecodeBounds = false;
        int w = newOpts.outWidth;
        int h = newOpts.outHeight;
        //现在主流手机比较多是800*480分辨率，所以高和宽我们设置为
        float hh = 800f;//这里设置高度为800f
        float ww = 480f;//这里设置宽度为480f
        //缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可
        int be = 1;//be=1表示不缩放
        if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放
            be = (int) (newOpts.outWidth / ww);
        } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放
            be = (int) (newOpts.outHeight / hh);
        }
        if (be <= 0)
            be = 1;
        newOpts.inSampleSize = be;//设置缩放比例
        //重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了
        bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
        //bitmap = BitmapFactory.decodeFileDescriptor(getContentResolver().openFileDescriptor(data1, "r").getFileDescriptor());
        return compressImage(bitmap);//压缩好比例大小后再进行质量压缩
    }
    /**
     * 图片质量压缩
     * @param bitmap
     * @return
     */
    public static Bitmap compressImage(Bitmap bitmap){
        // 0-100 100为不压缩
        int quality = 100;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        // 把压缩后的数据存放到baos中
        bitmap.compress(Bitmap.CompressFormat.JPEG, quality, baos);
        quality=99;
        while ( baos.toByteArray().length / 1024>100 && quality > 0) {	//循环判断如果压缩后图片是否大于100kb,大于继续压缩
            baos.reset();//重置baos即清空baos
            quality -= 10;//每次都减少10
            bitmap.compress(Bitmap.CompressFormat.JPEG, quality, baos);//这里压缩options%，把压缩后的数据存放到baos中
        }
        byte[] bytes = baos.toByteArray();
        Bitmap bitmap1 = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
        System.out.println(bitmap1.getRowBytes()*bitmap.getHeight());
        return bitmap1;
    }
}
